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Combined type ultrasonic transducer

A transducer and ultrasonic technology, used in instruments, radio wave measurement systems, piezoelectric devices/electrostrictive devices, etc., can solve problems such as failure to detect echo signals

Inactive Publication Date: 2008-08-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the Doppler effect, if the frequency band of the ultrasonic transducer is too narrow, the frequency of the echo signal reflected by the fast moving target is likely to fall outside the bandwidth of the transducer, making it impossible for the transducer to detect the echo Signal

Method used

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  • Combined type ultrasonic transducer
  • Combined type ultrasonic transducer
  • Combined type ultrasonic transducer

Examples

Experimental program
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Embodiment Construction

[0030] figure 1 It is the structural diagram of the piezoelectric ceramic disc ultrasonic transducer sold in the domestic market published by China Sensors Network (www.chinasensors.com). figure 2 It is the structure diagram of air-mediated ultrasonic transducer published by Ultrasonic Sensor Network (www.airmar.com). They all consist of a transducer shell 1, a matching layer (ie acoustic window) 2, a piezoelectric ceramic disc transducer 3, a backing 4 and an outgoing cable 5 of the piezoelectric ceramic disc transducer. If they are used as ultrasonic transducers for both receiving and sending, and are equipped with appropriate driving circuits, receiving circuits and signal processing circuits or algorithms for actual transducers, such transducers can also be used as large-range ultrasonic ranging transducers use. However, since the passband of the piezoceramic disc transducer is usually only 4kHz in the air medium, it can only be used to detect static or low-speed moving...

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Abstract

The invention discloses a compound supersonic transducer. It is formed by a casing, a matching layer, a piezoelectric ceramic disk transducer, a back fill, a lead cable and a Cymbal array receiver. The piezoelectric ceramic disk transducer is formed by thickness direction polarized PZT-5 piezoelectric material; the Cymbal array receiver is formed by 8-16 Cymbal transducers, two mental rings and a rubber pad. The piezoelectric ceramic disk transducer is used as basic supersonic transducer, which sends and receives the supersonic signal; the Cymbal array receiver is positioned on the disk piezoelectric transducer as supersonic receiver used to receive the Doppler etch wave signal outside the disk transducer band.

Description

technical field [0001] The invention relates to an ultrasonic ranging transducer, in particular to a broadband ultrasonic transducer which can be used to detect long-distance and high-speed moving targets. Background technique [0002] Ultrasound has beam and reflection characteristics, can basically propagate along a straight line, and its energy is much greater than low-frequency sound waves of the same amplitude. The non-contact ultrasonic ranging transducer is made using this characteristic of ultrasonic waves. In the air medium, the performance of the ultrasonic ranging transducer is hardly affected by light, dust, smog, electromagnetic interference and toxic gases, and it is cheap and easy to use. Therefore, it is widely used in level measurement, automatic navigation of vehicles and robots, Ultrasonic ranging transducers have a wide range of uses in many fields such as object recognition and positioning, vehicle safety driving assistance systems, and even terrain dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/08G01S7/521B06B1/06
Inventor 潘仲明王跃科乔纯捷杨俊
Owner NAT UNIV OF DEFENSE TECH